Based on the video, I'd say the company's culture is safe.
She admitted on camera to having underperformed.
She did not close a single contract, while working in sales, which translates as 'the company did not make any money as a result of her presence'.
She literally admitted in the video that she did not hit the expected sales target. She did not close a single contract.
If you 'put a lot of effort' into something, but your efforts do not reflect on the stats/figures in the management report, you are let go.
Simple as that.
Yes, it's a competition.
No, you don't have to like it.
If you accept to be a part of it by signing the employment agreement, you're in if you perform, you're out if you underperform.